It all depends upon what limits suspension travel.
If the limit is a suspension bump-stop, drop spindles will allow lowering ride height while using stock-height springs, and keeping stock suspension travel. This is advantageous in situations where lowering springs would have to be unacceptably stiff to avoid bottoming, and thereby contribute to ride harshness, and require stiffer damping. This is a common method used on trucks and SUVs, for example, as they typically have loads of wheel & tire clearance when stock.
If the limit is wheel rub, drop spindles don't help. They can make matters worse, but the list of variables grows large: tire size, wheel offset, suspension geometry, ackerman, etc.
If the limit is ground clearance, drop spindles definately hurt.
One little-discussed issue with drop spindles is that they typically increase the scrub radius of the front suspension (sometimes by quite a lot). This can be good or bad, but is usually bad on mass-produced vehicles, because they come from the factory with minimal SR to begin with. I haven't analyzed the Tiger suspension, but this is something to watch out for.